Using these Baggu Standard Shopper bags is super easy. You can carry them by hand or throw them over your shoulder to transport 2 - 3 plastic grocery bags' worth of items. They're strong enough to hold up to 50lbs, so you can load them up with your shopping. When you're done, just fold each bag neatly into its own 5' × 5' flat pouch. This makes them easy to store and take with you on your next trip. To keep them clean, you can simply toss them in the washing machine. Just be sure to follow the normal washing instructions. And remember, these bags are made of recycled ripstop nylon, so treat them well to ensure they last you a long time.